Grinding machine



June 14, 19 32. M. o. TRUDEAU I 1,862,834 I GRINDING momma Filed Feb. 23'. 1930 2 Sheet s-Sheet 1 igmnmtoc June 14, 1932. Q TRUDEAU 1,862,834

GRINDING MACHINE Filed Feb. 28, 1930 2 Sheets-Sheet 2 Lilly. 3 76 I ll Zlwuentoz Patented June 14, 1932 UNETED STATES.

PATENT OFFICE MAX 0. TRUDEAU. OF CINCINNATI, OHIO, ASSIGNOR TO CINCINNATI GRINDEBS IN- CORPORATED, F CINCINNATI, OHIO, A CORPORATION OF OHIO GRINDING MACHINE Application filed. February 28, 1930. Serial N0.'432,192.

This invention relates to improvements in machine tools and especially to improvements in grinding machines. I

An object of this invention is the provlsion of improved means for effecting a slow axlal reciprocation of the rotating memberof a ma: chine tool organization such as a grinding wheel spindle or the like.

Another object of the invention is the provision of improved mechanism of the above mentioned nature that may be adjusted at the will of the operator to vary thelength of stroke of the grinding wheel spindle through a range from zero, or no reciprocation to the maximum thereof.

Another object of the invention is the provision of a small durable compact structure to accomplish the above noted objects that may be readily applied to existing spindles without in any way modifying the same or its supporting housing.

Other objects and advantages of the present invention should be readily understood by reference to the following specification considered in conjunction with the accompanying drawings forming a part thereof and it is to be understood that any modifications may be made within the structural details without departing from or exceeding the spirit of the i" invention.

Figure 1 is a fragmentary perspective View of a grinding machine housing and spindle including a device of this invention.

Figure 2 is a sectional view taken 22 of Figure 1.

Figure 3 is a sectional view taken on line 33 of Figure 2. I i

Figure 4 is a sectional view taken on line 44 of Figure 2. i

Figure 5 is an end elevational view ofthe improved structure of this invention.

Figure 6 is a sectional view taken on lin 66 of Figure 3.

Throughout the various views of the drawings similar reference characters are employed to denote the same or similar parts.

A device of this invention may comprise a bed or support 10 having mounted thereon the bearings 11 for the grinding wheel spindle 12.

on line A grinding wheel 18 is secured to the end of the spindle 12 to be rotated thereby.

Heretofore, mechanisms have been provided for axially reciprocating the spindle12 and wheel 13 carried thereby to break up grinding lines on the work piece. These mechanisms were more or less set up to provide a certain definite length of stroke of reciprocation and could not be changed except by replacing an integral part within the mechanism necessitating new and different parts and a large amount of time and an experienced party to accomplish the change. By the invention here disclosed thelength of stroke may be varied as necessary or desired by simply adjusting a manually operable handle or the like.

The spindle 12 is provided on the end thereof with a reduced threaded part 14 received within the threaded bore 15 formed in one end of stub shaft 16. Pinned or otherwise secured to a stub shaft 16 is a tubular worm shaft 17 having integral therewith Worm 18 on one end and a flange 19 on the other end. The flange 19 abuts a shoulder 20 on the spindle 12 .and has a pin 21 extending there through into the spindle proper for securing the tubular shaft 17 to the spindle to be driven thereby.

A sleeve 22 surrounds the other end of the stub shaft 16 and has a collar 23 on the end thereof extending within the. bore in tubular shaft 17. The sleeve 22 forms an abutment for intermediate race 24 of anti-friction thrust bearing 25 and the said race 24 is clamped against the end of the sleeve 22 by a lock nut 26 having a spacer 27 extending between itself and the said intermediate race 24. Bearing balls or the like 28 and 29 are mounted on opposite sides of intermediate race 24 and respectivelyengage outer races 30 and 31. The inner race 24, bearings 28 and 29 and outer races 30 and 31 are enclosed within a sleeve 32 in which'they are securely clamped of a housing 37 which encloses the reciprocati} ing mechanism. To prevent rotative but not a-Xial movement of the sleeve 35, a. key 38 is interposed between the same and the bearing. The sleeve 32 in addition has a portion formed on the forward end thereof to form a lug 39 to position a coil spring etO which abuts on one end with the sleeve tending to urge it toward the left as seen in Figure 2 while the other end of the spring abuts a closure plate 41 likewise having a positioning and guiding lug i2 formed thereon.

This spring 40 is utilized to take up any back lash that may exist in the parts and to prevent vibration thereof especially when the parts are in position to hold the spindle against axial movement or when no reciprocation is to be given the spindle.

lVorm 18 meshes with a worm wheel 43 keyed or otherwise secured to a vertically positioned shaft l-l rotatable in bearings a5 and 46 respectively formed integral with the housing 37 and a closure plate e7. The lower end of shaft 44 is provided with an eccentric 48 received in a follower block 49 positioned in a slot or channel 50 formed in oscillatable lever 51. ,The lever 51 is adapted to be oscillated about a movable pivot 52 working in a block 53 secured in one end of the lever 51 by a set screw or the like 54:. The other end of the pivot 52 extends through a perforation formed in one end 55 of control arm 56 and is secured therein by a nut or the like 57. An actuating stud 58 extends from the other end 59 of the arm 56 and is journaled in a boss or the like 60 integral with the lower closure plate 61 of housing 37. A handle 62 has one end 63 pinned or otherwise secured to the stud 58. (Jo-operating with the oscillatable lever 51 to efiect a reciprocation of the sleeve 32 is a block 64 having a bore therein to receive pin 65 secured by set screw or the like 66 on one end 67 of arm 68 extending from the sleeve 32.

From the foregoing description it will be noted that the rotating worm 18 drives the worm wheel 43 to rotate worm shaft 4A and eccentric 48. Eccentric L8 oscillates the lever 51 about pivot 52 and depending upon the position of pin 65 relative to the pivot 52 axially reciprocates the sleeve 32 and the mechanism carried and controlled thereby. The relationship between pivot 52 and pin 65 is controlled by the handle 62 whereby the pivot through arm 56 may be shifted relative to the pin 65. As shown in Figure 6 the maximum distance between the pivot 52 and pin 65 is illustrated so that the eccentric 48 will throw the arm 51 through its maximum arc, carrying with it the sleeve 32 and reciprocating the spindle 12 through its maximum stroke but if the handle 62 were actuated in a clockwise direction as seen in Figure 6 the pivot 52 would be swung through an arc until the center thereof was directly beneath the center of the pin 65 at which time the oscillation of the arm 51 would be about the center of pull on the sleeve 32 and consequently no movement of the sleeve would occur and the spindle would remain in its normal position.

To look the handle 62 in its various positions it is provided with a spring pressed plunger 69 having a locking point 70 thereon cooperating with a surreted or toothed looking plate 71 secured to the under surface of plate 61. A pair of stop pins 72 are also carried by plate 61 to limit the movement of handle 62 therebetween, one indicating the maximum sliding movement of the sleeve 32 and the other the minimum or zero point. To determine the amount of oscillation that may be had in various positions of the handle 62 between the maximum and the minimum pins 72 the housing 37 has secured thereto an indicator plate 73 on which suitable graduations are inscribed cooperating with a pointer 74 carried by the handle 62.

From this it will be seen that the operator can determine at all times what amount of oscillation is being supplied to the grinding wheel and its spindle and also change the length of stroke or amount of reciprocation of the spindle by simply withdrawing the locking plunger 69 to disengage it from the plate 71 and adjust the handle to the desired point as determined by the pointer 74 on the dial 73. I

The reciprocating mechanism just described is a-daptcd to be operated partly immersed within a bath of oil which is introduced within the housing 37 through a filling opening 75 which is normally closed by a ilug 76, and to keep the operator advised of the amount of oil within the housing a sight gauge 77 is secured in the end thereof by means of a suitable plate or the like 78. To prevent escape of the oil through various joints between the housing proper 37 and the various closure plates and caps gaskets such as 7 9 may be provided therebetween as well as between the end of the spindle bearing and the reciprocating housing mechanism.

What is claimed is:

1. In a grinding machine the combination of a spindle, bearings for the spindle, means to reciprocate the spindle through its bearings including a rotating shaft, an eccentric carried and driven thereby, pivotally mounted lever adapted to be oscillated about its pivot by the eccentric, means connecting the lever with the spindle whereby the oscillations of the lever are converted into axial reciprocations of the spindle, and means to vary the length of oscillations of the lever to thereby vary the stroke of reciprocation of the spindle.

2. In a grinding machine the combination of a spindle, bearings for the spindle, means to reciprocate the spindle including pivotally mounted arm, an actuating lever pivotally carried by the arm, means for oscillating the lever, an operative connection between the lever and spindle to reciprocate same, and means for 'actuating'the arm about its pivot to vary the relationshlp between the pivot i of the actuating lever and the spindle connection thereto.

3. In a'grinding machine the combination of a spindle, bearings for the spindle, means to reciprocate the spindle including a pivotally mounted arm, an actuating lever pivotally carried by the arm, means for oscillating the lever, an operative connection be-.

a: tween the lever and spindle to reciprocate same, means for actuating the arm about its pivot to vary the relationship between the pivot of the actuating lever and the spindle connection thereto, said means including a manually actuable handle, and means asso ciated with handle indicating the relationship between the actuating lever pivot and spindle connection therewith.

5. In a device of the class described the combination with a bed or support, bearings carried thereby, a spindle rotatably ournaled therein, of means for reciprocating the spindle through the bearings comprising a housing, a drive shaft therein rotated by the spindle, a driven shaft operated by the drive shaft, an eccentric on the driven shaft, a pivotally mounted actuating lever oscillated about its pivot by the eccentric, an operative connection between the actuating lever and spindle whereby the oscillation of the actuating lever is transformed into axial reciprocation of the spindle, and 'means for changing the relationship between the actuating lever pivot and the point of application of power thereto by the eccentric for varying the throw of the lever to change the reciprocations of the spindle.

6. In a device of theclass described the combination with a bed or support, bearings carried thereby, a spindle rotatably journaled therein, of means for reciprocating the spindle through the bearings comprising a shaft secured to and rotated by the spindle a sleeve surrounding the shaft, an anti-friction thrust bearing within the sleeve and supporting one end of the shaft, a tongue extending from the sleeve, an actuating lever, means pivotally connecting the tongue to the lever intermediate its ends and means actuating the lever about its pivot to reciprocate the sleeve and parts secured thereto.

7 In a device of the class described the combination with a bed or support, bearings carried thereby, a spindle rotatably journaled therein, of means reciprocating the spindle through the bearings comprising a shaft secured to and rotated by the spindle, a sleeve surrounding the shaft, an anti-friction thrust hearing within the sleeve and supporting one end of the shaft, a tongue extending from the sleeve, an actuating lever, means pivotally connecting the tongue to the lever intermediate its ends, means actuating the lever about its pivot to reciprocate the sleeve and parts secured thereto, and means to vary the oscillations of the lever to change the reciprocations of the sleeve.

8. A grinding wheel spindle reciprocating attachment comprising a housing, a rotating shaft therein, an eccentric driven by the shaft, a channeled pivoted actuating lever, an eccentric follower within the channel in the actuating lever to oscillate same thereby, and an operative connection between the actuating leverand spindle for converting the oscillations of the lever into reciprocations of the spindle. V

9. A grinding wheel spindle'reciprocating attachment comprising a housing, a rotating shaft therein, an eccentric driven by the shaft, a channeled pivotally mounted oscillatable actuating lever, a pair of apertured slide blocks within the channel in the lever, one of the blocks receiving the eccentric in its aperture whereby the lever is oscillated about its pivot, the other block receiving a pivot within its aperture, means connecting the second block pivot with the spindle whereby the oscillation of the lever is converted into reciprocations of the spindle, and means'for sliding the blocks through the channel for varying the relationship between them whereby the oscillations of the lever are lengthened or shortened to correspondingly vary the reciprocating stroke of the spindle. 7

10. A grinding wheel spindle reciprocat ing attachment comprising a housing, a rotating shaft therein, an eccentric driven by the shaft, a channeled pivotally mounted oscillatable actuating lever, a pair of apertured slide blocks within the channel in the lever, one of the blocks receiving the eccentric in its aperture whereby the lever is oscillated about its pivot, the other block re- 7 ceiving a pivot within its aperture, means connecting the second block pivot with the spindle whereby the oscillation of the lever is converted into reciprocations of the spindle and means for sliding the blocks through the channel for varying the relationship between the actuating lever pivot and the eccentric, slide block wherebythe oscillations of the lever are lengthened, or shortened to correspondingly vary the reciprocating stroke of the spindle, said means comprising a manually actuable lever and means associated with the lever to indicate the relationship of the actuating lever pivot, and eccentric slide block to determine the length of reciprocating stroke of the spindle.

11. A grinding wheel reciprocating attachment comprising a housing having a bearing formed therein, a sleeve mounted for sliding but not rotative movement in and relative to the bearing, means connecting the sleeve to the spindle, and means for reciprocating the sleeve through the bearing includ ing a ton ue carried by the sleeve, an oscillatable lever having a shiftable pivot, a sliding connection between the tongue and oscillatable lever, means for oscillating the lever about its pivot to reciprocate the sleeve, and means for shifting the pivot of the lever relative to the sliding connection of the tongue therewith, whereby to modify the reciproczn tion of the sleeve.

12. A grinding wheel reciprocating attachment comprising a housing having a hear-- ing formed therein, a sleeve mounted for sliding but not rotative movement in and relative to the bearing means connecting the sleeve to the spindle, and means for reciprocating the sleeve through the bearing including a tongue carried by the sleeve, an oscillatable lever having a shi table pivot, a sliding connection between the tongue and oscillatable lever, means for oscillating the lever about its pivot to reciprocate the sleeve, and means for shifting the pivot of the lever relative to the sliding connection of the tongue therewith, whereby to modify the reciprocation of the sleeve, said means including a manually operable handle.

13. A grinding wheel reciprocating attachment comprising a housing having a bearing formed therein, a sleeve mounted for sliding but not rotative movement in and reiative to the bearing, means connecting the sleeve to the spindle, and means for reciprocating the sleeve through the bearing including a tongue carried by the sleeve, an oscillatable lever having a shiftable pivot, a sliding connection between the tongue and oscillatable lever, means for oscillating the lever about its pivot to reciprocate the sleeve, and means for shifting the pivot oi the lever relative to the sliding connection of the tongue therewith, whereby to modify the reciprocaion of the sleeve, said means inchiding a manually operable handle to indicate the position of the pivot and amount of reciprocation being supplied to the sleeve.

14. A grinding wheel reciprocating mechanism comprising a spindle, an oscillatable lever, a shiftable pivot connection between the lever and spindle, means for oscillating the lever for reciprocating the spindle, and means for-shifting the pivot of the lever relative to its connection with the spindle from points remote from one another to a position having the said pivot points superimposed on one another for varying the reciprocations oi the spindle from maximum to zero.

15. In a grinding wheel reciprocating attachment the combination of a spindle, a lever having a shiftable pivot, power operated means for oscillating the lever about its pivot, a connection between the lever and spindle, and means for varying the distance between the lever pivot and its point of power application whereby the length of oscillation of the lever is changed and consequently the length of reciprocation of the spindle.

16. In a grinding wheel reciprocating attachment the combination with a spindle, of a channeled arcuate shaped lever, means secured to one end of the lever aiTording it a pivot, an d "for shifting it through a path parallel with its arcuate contour, power operated means engagable with the lever at its free end for eil ecting oscillation thereof about its pivot, a connection between the lever and the spindle, said connection occurring at a point substantially midway of the lever, and means for shifting the arcuate lever for advancing its pivot toward the point of connection of the spindle thereto and toward the point of power application whereby the length of osci lation of the lever about its pivot is varied for correspondingly varying the length of reciprocation of the lever.

17. In a spindle reciprocator for use with grinding machines the combination with a grinding wheel, of a shiftable pivotally mounted lever, a connection between the lever and spindle whereby oscillations to the lever are converted into reciprocations of the spindle, and means for infinitely varying the position of the lever pivot relative to the spindle connections for effecting an infinite number of spindle reciprocating strokes.

In testimony whereof I affix my signature.

MAX 0. TRUDEAU. 

